Create a joyful advertising poster for a fictional children's cereal brand "SUNNY POPS". FORMAT: 1:1 square, bright playful commercial layout. SUBJECT: an adorable 3D cartoon sun mascot with rosy cheeks hugging a cereal bowl, colorful cereal loops and milk splash bouncing playfully around. BACKGROUND: cheerful sky-blue gradient with fluffy clouds and a rainbow arc. LIGHTING: bright even cartoon light, soft glossy highlights, happy vibrant colors. TYPOGRAPHY: bold bubbly rounded logo "SUNNY POPS" top-center, tiny "Start your day happy!" at the bottom. FINISH: high-detail Pixar-style 3D render, wholesome fun commercial finish.